5 inches, 5 oz. - a turnip

Your baby's skeleton is changing from soft cartilage to bone, and the umbilical cord — her lifeline to the placenta — is growing stronger and thicker. Your baby weighs 5 ounces now, and she's around 5 inches long (about the size of a turnip) from head to bottom. She can move her joints, and her sweat glands are starting to develop.

This week might also mark the first time you feel baby move inside you, but don't worry if it's another two months before you notice anything. (Or realize that this time, it's actually not gas.)